Abstract
Combined with the focusing schlieren and dynamic pressure measurement technology, the flow field and nozzle wall pressure were experimentally measured, under the different nozzle pressure ratios (NPR) of the single expansion ramp nozzle (SERN). Time and frequency domain analysis provide unsteady flow characteristics within the nozzle. The results show that the flow field structure inside SERN is asymmetry. The flow separation mode on the upper wall of the nozzle is restricted shock separation (RSS), while on the lower wall is free shock separation (FSS); in RSS mode, the pressure on the wall near the outlet sharply oscillated relative to FSS mode. Near separation point, the shock motion exhibits obvious low-frequency characteristics, and the separated shear layer has an influence on the wall pressure near the nozzle exit.
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